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Finding the Third Proportional to 290,438 and 629,128

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Solution

The third proportional to 290,438 and 629,128 is: 1,362,776.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,438 : 629,128 = 629,128 : x
  2. Step 2: Convert to fraction form
    290,438/629,128 = 629,128/x
  3. Step 3: Cross multiply
    290,438x = 629,128 × 629,128
  4. Step 4: Simplify right side
    290,438x = 395,802,040,384
  5. Step 5: Solve for x
    x = 395,802,040,384/290,438
  6. Step 6: Final answer
    x = 1,362,776.36

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.